Re: do { quit; } else { }

The else part might need access to some local variables
in the main part.
    do {
      char *name = calculate_path(PATH_PREFIX "/", name, ".txt");
      FILE *f = fopen(...)
       if (!f)
        quit;
      ...
   }
   else
   {
      printf("unable to open %s\n", name);
      ...
   }